Even if the precise beginning of the expression isn’t identified, it’s broadly related to the Wild West, with maximum depictions of the Americas on the 1800’s together with it.
It possibly was once a mincing of the word “Get ye up” or “Get thee up”, slowly morphing in combination and forming in its lately identified model in the second one part of the nineteenth century.
Some of the earliest appearances of “Giddy up” in print comes from the radical of J. Panton Ham, revealed beneath the identify “The Bridal Bar” in 1872.